639230 has 16 divisors (see below), whose sum is σ = 1164240. Its totient is φ = 252672.

The previous prime is 639211. The next prime is 639253. The reversal of 639230 is 32936.

It is a happy number.

It is a super-2 number, since 2×639230² = 817229985800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 639196 and 639205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641 + ... + 1299.

It is an arithmetic number, because the mean of its divisors is an integer number (72765).

2⁶³⁹²³⁰ is an apocalyptic number.

639230 is a deficient number, since it is larger than the sum of its proper divisors (525010).

639230 is a wasteful number, since it uses less digits than its factorization.

639230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 639230 is about 799.5186051619. The cubic root of 639230 is about 86.1428130086.

The spelling of 639230 in words is "six hundred thirty-nine thousand, two hundred thirty".